Combined lock and latch



I .1, 2 May 10,1921. a CAWTHRON 6 8,354

COMBINED LOCK AND LATCH Filed March 9, 1926 3 Sheets-Sheet 1 Inventor6'. '4 cot/0'02,

Attorney May 10, 1927. 1,628,354

G. CAWTHRON COMBINED LOCK AND LATCH Filed. March 9, 1926 5 Sheets-Sheet2 I nventbr 6. 'awirarp;

' max/ Attorney G. CAWTHRON COMBINED LOCK AND LATCH May 10 1927.

s She'etS-Sheet3 Filed March 9, l926- I Inventor 6'. 6 42067270!Attorney Patented May 10, 1927.

lai28,354

PAT N oFs cE.

1 GEORGE oawrnnon, or runnwoonorry, CALIFORNIA.

COMBINED LOCK AND LATCH.

Application filed March 9; 1926. Serial no. 93,481.

This invention relates to .a combined lock and'latch, particularlyadaptedfor installation within swinging doors,and has for its primaryobject to provide means whereby the latch bolt may be' readily securedin projected position within its door iran'ie keeper 7 I for thusovercoming the necessity of providing a separate lock bolt for the'lockmech anism. e

A further object is to provide a combined lock and latch of thischaracter wherein afterthelatch bolt has been locked in said projectedposition, it will be practically im possible for the lock to be pickedor the bolt bility of disarrangement to a minimum'and to facilitate theretraction of the latch bolt through reason ofthe usual hand knob, andalso to facilitate the ready locking oi the latchbolt. when in projectedposition.

Other objects will become apparent as the nature of the invention willbecome better understood, the same comprising the novel form,combination and arrangement of parts hereinafter more fully described,shown in the accompanying drawings, and claimed.

In the drawings wherein like reference characters indicate correspondingparts throughout the various views Figure 1 is a tlragmentary outsideelevationof a conventional swinging door that is equipped with myimproved combined lock and latch, certain portions of which arebrokenaway, while parts thereof are disposed in crosssection forpurposes of clearness,

Fig.2 is a similar View of the mechanism, the door plate and casingcov'erplate thereot being. removed, while the door is also partlydisposed in section for more clearly illustrating the construction ofthe mechanism, I

Fig.3 is a view somewhat similar to Fi 2, the various elements thereofbeing however'disclosed in latch bolt locking condition,

drawin r the provision of a metallic casing 0 Fig. i is a detailverticalsection through the door and combined lock and latch,

Fig. 5 is' a fragmentary horizontal section therethrough Fig. 6 is afragmentary. section through the upper end of themechanism, certainele-' ments or construction being removed for more clearly disclosingthe inner end construction ot thesliding latch bolt,

.Fig. 7 is a fragmentary vertical transverse section through the centerportion of the mechanism for more clearly disclosing the construction ofthe latch bolt locking member per se, 7 r

Fig. 8 is a sectional view taken through the knob control latchboltreleasing element per se, 7 I Fig. 9 an inner side elevation of theinner end of the latch bolt, and

Fig. 10 is an inner side elevation of the keeper plate of the combined"latch bolt.

Now havingparticular reference to the my novel mechanism constitutesthat is so constructed as to provide three interconnecting circularportions as clearly disclosed in Figs. 1, 2 and The door A is suitablymortised or pocketed adjacent the free edge thereof to receive thiscasing while leading from said mortise or the pocket at the upper edgethereof in a direction toward the free edge of the door is a channel 6through which the latch bolt of the device freely moves. The outer endof this channel is equipped with the usual metallic guide plate 7 thatis formed, with an opening in its center to permit the head of the boltto slice inwardly and outwardly thereof.

At the sides ot' the two lowermost circular sections ot'the casing 5 areoutwardly projecting flanges '8, the flanges of the lowermost circularsection connecting as clearly shown in Figs 2 and 3. These flanges whicheffect the side walls of the casing facilitate the positioning of thesame within the door mortise or pockets, and also properly support thecasing when disposed therein. The uppermost circular portion of thecasing is unfianged at its sides, but is at its upper edge formed with acircular flange 9 serving for the same purpose as the flanges oi? thecircular portion.

Extending longitudinally across the outer face of the uppermost circularportion of the casing 5 are spaced parallel ribs 1 11,- l

serving as a guide for the inner end of the lateh liolt which isdesignated in its entirety by the character 12, the inner end of whichis in the form of a rectangular shaped plate 13 mounted tor tree slidingnloveinent be tween said ribs ll--ll while the outer end thereoi' is inthe term of a conventional head l t slidable through the opening in thechannel closing plate 7, said head and said plate letand illrespectively being adj nstably iln'ereonnceteil through inediuin o-t abolt to that is carried by said head and that is threaded at its innerend tor threaded engageuienl within a threaded opening in the adjacentend ot said plate as more clearly shown in Fig. 5.

The center of the rasing rt the upper rirenlar portion thereot termedwith an opening it Fig. 3. for a purpose hereinatter niore tullydescribed. and projecting laterally inwardly llUlll the ribs lfl-ll atdiametrieallzv opposed sides of said opening, lugs l'i' lT, Figs -landti. The under side ot' the plate 125 of the latch bolt 12 is soconstructed as to provide longitudinal sock-- ets l8lti at oppositeedges thereof and adjacent the outer end ot the plate tor the receptionof the inner ends oi expansible coiled springs lllt the outer ends otwhich are adapted to engage said lugs 17 l? to normally itoi'ce thelatch bolt outwardly to theposition shown in Figs. 1, .2, and 6, saidsprings however, permitting oil the tree inward sliding movement ol saidlatch bolt when the same strikes the usual keeper in the door jainb, notshown.

The plate 13 ot said latch bolt 12 is tun ther torinetil with anelongated opening :20 at its inner end, the same being at all times inFt ;;tration with the opening it; in said casing and through whichopening is removably disposed a sleeve 21. the interior o't which issquare shaped l'or receiving the knob eontrol shalt or spindle 22 thatprojeels through the opposite sides oi the door and is adapted torrereiving the ronventionat knobs. here not shown.

"lhe 'torward end oi this i-ileeve 31 is also of square shapeexternally. and upon which is to be arranged a eireiillar plate 2 3,that consists oi a pair oit spaeed disks 2-l-2l interconnected at theirperiineters through me dium ot' rivet pins :25. Coiled between the disksaround the squared registering openings in the center thereof is alength of spring wire 20, the ends ot which are projected outwardlythereojt upon opposite sides ot one ot the ronnectiug rivets as clearlyshown in llig. h. 'll'iese ends of the wire are adapted to engage alongopposite sides ot' a rib 2T 'lorrned upon the inner side of an outwardlyprojecting internally threaded sleeve 2% that is termed integrally withthe casinga directly beneath the upper edge of the central circularsection of the casing as clearly shown in Figs. 2, 3, t and (S.

The annular member 23 serves as a supporting bearing for the sleeve 21,while the spring 26 serves as a means for returning the shaft 532 andsaid nien'iber 23 to the position disclosed in Figs. 1, 2, 3, t, 5 and Gat which position the latch bolt 12 in its outwardly projected state.

At the inner end ot the latch boltplate lit at opposite sides ot theopening 20 therein are lugs 29--2tl. the inner edges ol? which areadapted to he engaged by the opposite ends oi? a win -shaptal plate tit).tOlIlltlt'tllPOh the opposite side (it the shat! receiving sleeve :Ziin order that when said shal't is turned in opposite directions. iitherend oil? said plate will engage against the respective lugs 'iorretracting the latch bolt against the noiion ot the springs 1%)19.

itt opposite sides oil the center of the middle circular portion of thecasing 5 are pins Si -L the inner opposed side ends ol which arerabbeted for receiving the opposite edges ot a s-:(11iai'(i-sl1zipe :lsliding plate it: that is termed at one end and at its upper edge with avertically extending linger 33, that will engage the back of theadjacent end of latch bolt plate l3 when said bolt is projected and whensaid plateis slid opt ardly between the pins 3131 in a inannerhereinatter more tally ClQSCITllLK-Btl tor obviously locking the latchbolt in its projeeted position.

The opposite sides of the finger 33-4-32. are termed with lateralbearing blocks Sits-34 the inner one of which rests upon the easing 5while the eover plate tor the casing hereinafter more fully describedongages against the outer one of the blocks as clearly shown in Fig 2-,said blocks servh'ig io assist the pins 31Z:ll in the n'oper sup port ofthe plate 32. The inner block on both of the blocks are formed at theirup per ends with sockets 35 the socket in the block adjacent the casing5 ada 'ited to receive one endo't an expansihle coiled spring it, theopposite end thereof nojeeting against the lowermost rib il'l.hereinbetore deseriliied, said spring normally serving to maintain theplate in the position shown in Fig. thus .ierinitting ott lle retractionof the bolt when the head 14 thereof strikes the keeper in the doorframe or under action of the knob control shaft or spindle 22.

The plate 32 is formed with an opening 37, the upper edge of which isnotched at :38 intermediate its ends while the opposite ends of theopening at the upper edge thereof are so formed as to provide pinreceiving and retaining notches B ):l9. Pivoted to the casing 5(:lireetly beneath the previously mentioned sleeve 28 is the upper endof a swinging latch plate 10, the lower edge of Ill III]

which is widened and notched intermediate its edges for providing a pairof fingers 41-41. Upon the outer side of said plate and adjacent theedge thereof next to the finger carrying edge of the ,plate 32, is anoutwardly projecting pin 42 that is adapted to engage within the notch39 beneath the finger 33 of the plate 32 when said plate has been forcedupwardly, and the latch plate swung into the position shown .in Fig. 3for maintaining the fingers 33 of said plate 32 in an upward position inback of the latch bolt 13 for retaining said latch bolt in projectedposition.

At this point, it may be well to state that the reason forthe sockets inthe bearing block of the finger carrying plate 32 and the provision ofthe notches 39-39 at opposite sides of the opening 37 in said plate isto permit this plate to be disposed reversely within the casing 5 shouldit be necessary to dispose the mechanism in the opposite side of thedoor A from that shown in the figure, such a reversal of position ob-,

viously necessitating the reversal of the other elements of constructionsuch as the latch bolt 12, sleeve 21, etc., etc.

The lower circular section of the casing 5 is formed centrally with aT-slot 43 within which is adapted to be inserted a properly formed key44, the head of which is so con struct-ed as to first engage the loweredge of the finger carrying plate 32 when the same is turned .in theopening for obviously raising said plate, and then engaging the finger41 of the latch plate 40 beneath the pin 42 for swinging said latchplate upon its pivot to engage said pin 42 within the adjacent end notchof the plate opening 37.

After the lock has been assembled in the door in a manner as heretoforedescribed and as shown in the drawing, a casing cover plate 4-5 isdisposed thereover, the same being shaped complementary to the casingand secured thereto by reason of a locking screw 46 that passes throughan opening in the cover plate, which when positioned will register withthe sleeve 28 that receives the threaded shank of the screw in a manneras clearly disclosed in Fig. 4:. Upon opposite faces of the door are theusual ornamental lock cover plates 4747,

It will be readily understood by reviewing the accompanying drawing andby perusing the foregoing specification, that I have provided a highlynovel, simple, and

.el'licient form of combined lock and latch' mechanism that is welladapted for all of the purposes designated, and even though I have shownand described the mechanism as including certain detail structuralelements, it is nevertheless to be understood thatjdepartures may be hadwithout efiecting the spirit and scope of the appended claim. r

spindles, a spring coiled'about the spindle and confined between thespaced members, a pm projecting laterally from the casing, the free endsof the spring extending on opposite sides of the pin in engagementtherewith. I i

In testimony whereof I afiix my signature.

GEORGE OAWTHRON,

